Apple Music Library disappeared.

I cancelled my Apple Music subscription on 25th July and resubscribed on 29th September.

I got a new phone and wanted to try syncing my library on my MAC with the library on the new phone seeing as all of my music was STILL on my MAC and not appearing on my phone.

I pressed the sync library button on and off (from my MAC) in an attempt to link the music between both devices.

All of my music has disappeared from my MAC library apart from a few songs I bought with actual money.

I connected my MAC, iPhone and iPad together (2 devices at a time) in an attempt to get my music back.

Around 70 songs reappeared all songs being those I recently added to my Library the last time I had the subscription active from July but nothing else has reappeared.

Is there a supposed time limit before I have to resubscribe before my songs are lost?

Is there any method / approach that I can take to get the data back for the songs I previously had on my library? Could I send my MAC off to somewhere in London and have them look into it for me?

Please can someone answer.